Christa B. Allen's Pin-Up Side Sweep

Wearing your hair loose is usually reserved for those days when you're rocking freshly washed locks. But with a little dry shampoo and one simple trick, you no longer have to suds-up your hair to wear it down.

Revenge's Christa B. Allen learned the trick from L.A. hair guru Luke Chamberlain, and now she can add a non-updo style to her arsenal of dirty-hair looks. "I love how feminine this is," she tells Us Weekly of her pin-up side sweep.

Christa B. Allen with pin-up side sweep hairCredit: Marc Royce

Watch the video above and find out the secret to creating volume when your tresses are looking flat.